Low power consumption particle picture velocity measurement system based on bicolor laser scanning technique

Abstract

The invention discloses a low power consumption particle picture velocity measurement system based on a bicolor laser scanning technique. The low power consumption particle picture velocity measurement system comprises a laser assembly, a photographing assembly and a galvanometer or rotating prism. The laser assembly comprises two or more laser devices transmitting low power consumption continuous lasers, and the laser devices are driven by a battery. The galvanometer or rotating prism scans two or more laser beams into a measurement flow filed in sequence, and twice or more lighting of tracer particles in fluid is achieved. The photographing assembly comprises a Charge Coupled Device (CCD) camera, and particle scattered light passing through the measurement flow filed images on the CCD camera respectively to form a Particle Image Velocimetry (PIV) image group. According to the low power consumption particle picture velocity measurement system, one particle in the scanning filed is lighted twice in one-time scanning, the interval of two photographing time can be manually controlled, and therefore the high speed flow field photographing obstacle is removed on the premise of ensuring particle scattering intensity. Power consumption requirements of the system assemblies are greatly reduced, the system assemblies can be driven by the battery, and therefore the low power consumption particle picture velocity measurement system can be used for measurement of underground flow fields at the outdoor site.

Description

technical field [0001] The invention relates to a particle image velocity measurement system, in particular to a particle image velocity measurement system with low power consumption based on two-color laser scanning technology. Background technique [0002] PIV (Particle Image Velocimetry) is a major achievement in the field of modern flow field testing. It integrates laser technology, digital signal processing technology, chip technology, computer technology, image processing Dynamic flow provides a powerful tool. [0003] The basic working principle of PIV is: sprinkle suitable tracer particles in the flow field. When a laser is used to illuminate a certain section, the particles carried by the water flow will scatter the light, and the section image at this time will be recorded by synchronous high-speed photography. ; Take a second photo after a very short time (millisecond or microsecond) interval. Two or more consecutive instantaneous exposures record the images bef...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is the limitation that the traditional particle image velocimetry system must apply high-power pulsed laser, and the continuous laser with low energy consumption cannot reduce the time interval between two exposures under the condition of ensuring the necessary illumination intensity of tiny particles, so it is impossible to Problems Measuring High Velocity Flow Fields

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